Device for securing the injector or feed regulator in the tube of blowpipes



May 2 1950 R. R. GEFFROY 2,506,415

DEVICE EoR SECURING THE TNJEcToR oR FEED REGULATOR TN THE TUBE 0E ELowPIPEs Filed May zo, 194e Kober* Kin; Lou l s Gefo Patented May 2, 1950 DEVICE. FOR. SECURING THE. INJECTOR OR. FEED REGULATOR IN THE TUBE OF BLOW PIPES Robert Renv Louis; Geffroy, Neuilly-.sur-Seine, France, assgnorto Volcan S. A., Levallois,

France:

Application May 20, 1946, SerialNo. 670,973 In France `luly 3, 1943 Section 1, Public Law 691),.Aliilst- 8,k .1.9.4.6 Patent. expires J uly. 3, 196,3

ZvvGlaims.

The present invention relates to the method of securing the injector or feed regulator in the tube of. blow-pipeain particular in` Oxy-acetylene blow-pipes.

The injector or feed regulator must be easily taken apart inA order to'clear the conduits for the passage. of the acetylene of carbon which may have been formed therein. In the past the injector usually has been screwed by its flange into the base of the tube. This assemblage has the following inconvenience: if the injector, after being takeny apart, is/not. screwed home, which mightbeliableto take. place, either by the operators carelessness, ,or owing. t theclogglng fthe screwtbread, theseCtiQnQr passage-Way between the nose of the injector .or feed regulator and the rear wall of its housing in the tube is modied, whereby the proportioning of the gaseous mixture is aiected.Y

To avoid this drawback and according to the invention, the injector or feed regulator is provided with a smooth cylindrical flange engaging in a bore formed in the base of the tube and which abuts against a shoulder of said base, the whole being rendered rigid by a resilient slotted ring engaging a groove of the base.

Owing to this arrangement, the ring can only be placed in position when the injector is pushed.

home into its recess, and consequently, the section of the passage-way for the gases remains constant.

Figure 1 is a view of the blow-pipe body in cross-section showing a manner of securing the injector therein.

Figure 2 is a view taken on the line 2-2 1n Figure 1.

In the accompanying drawing which shows, by way of example, a form of construction of the invention, I designates the end of the blow-pipe body, perforated with channels 2 and 3 for the admission of the gases and 4 designates the rear end of the tube, perforated with a mixing channel 5. The tube internally comprises an injector or feed regulator 6, perforated with an axial channel 1 and comprising a flange 8. Said flange is perforated with channels 9 leading to an annular passage IIJ. The continuity between the channels 2 and 'I and the duid-tightness as regards the channels 3, 9 and I I] are ensured by a nipple I I, screwed in the body of the blow- -pipe I and terminating in a spherical bearing I4, pressing against a corresponding bearing of the injector 6.

The securing in position of the tube is obtained for instance by screwing on the end of ticular, after taking the injector 6"-apart, it-'fis necessary to avoid that the latter;l when fre-as'- sembled, occupies apositiondilerent fromthat assignedv thereto byV construction whichA would cause the` sectionV ofpassage-way'v I8- to vary` bei tween the nose of.- theinjector S and: ther rear wall of. the base ofI the tube; liorI eliminating thisrisk of' improper assembly, accordingt'o the invention the. flange I!` is. externally: smooth.. and engagesin a boreof the base of; the tubedzwith thei'langeinabuttingengagementwithashoulder filet tbebase. Inthis posiciona-nd only ini-this position, the wholev structureren be, maintained rigid by. af resilient slotted: ringr 2B: engagingain agroovefof thebase a.:

In addition to the abo-ve mentioned important advantage, this assemblage is of remarkable simplicity and of very economical machining.

It is to b-e understood that the invention is not limited to the details of construction above described, which have been given only by way of example.

Having now described my invention, what I claim as new and desire to secure by Letters Patent is:

1. In a blowpipe including a nozzle tube having an axially extending mixing duct for oxygen and a combustible gas, said duct opening at its rearward end into an enlarged cavity formed in said tube, and an injector nipple tted into said cavity with the main body thereof in spaced relation to the walls of said cavity and cooperating with the walls of said cavity to denne therebetween an annular passage for one of said gases leading to said mixing duct, said nipple having a central axially-extending duct for discharging the other of said gases to said mixing duct, means for insuring a precise predetermined positioning of said nipple in said cavity comprising a smooth cylindrical portion of the wall of the tube, said portion having a larger diameter than said cavity and extending inwardly from the rearward end of said tube and terminating at an internal rearwardly facing shoulder formed in the Walls of said tube, said cylindrical wall having an annular groove formed therein adjacent the outer, rearward end thereof, said nipple having at its rearward end a smooth external cylindrical ange snugly received within the bore dened by said cylindrical wall with the inner face of said flange engaging Said shoulder, said iiange having a thickness equal to the distance between said shoulder and said groove, and a yieldable split ring tted in said groove to hold the nipple in place with the inner surface of the flange against said shoulder and with the nipple held in the predetermined spaced relation to the walls of said cavity, said ring having a thickness such that the sum of the thickness of the flange and that of the ring is substantially equal to the distance between the shoulder and the end of the tube, whereby the nipple will not be held in seated position by the ring except when the ring is fully recessed in the groove.

2. In a blowpipe, the combination with a body having a rst central axially extending duct for one fluid and a second duct for another fluid, said second duct being substantially parallel and offset with respect to said rst duct, of a nozzle tube removably attached to said body, said tube having a first smooth cylindrical bore terminating at its outer end adjacent said body in an internal groove, said bore being terminated at its inner end by an internal shoulder in said tube separating said bore from a second concentric cylindrical bore of smaller diameter which connects at its inner -end with a third bore which tapers to a mixing duct of still smaller diameter extending axially of said tube, an injector nipple adapted for insertion in said bores and having a smooth external cylindrical ilange at its outer end snugly received in said rst bore with the inner surface of; the ange engaging said shoulder, said nipple having a cylindrical external wall portion extending inward from said flange and terminating in a tapered inner end portion, said cylindrical and tapered end portions being effective, when said ilange is in seating engagement with said shoulder, to define with the walls of said tube an annular passage of uniform cross-section and a tapering annular passage connecting the annular passage of uniform cross-section and the mixing' duct, said nipple having a central axially extending duct registering with the central duct of the body and the mixing duct, said flange having a series of annularly spaced ducts communicating with the odset duct in the body and registering with said annular passage, and a yieldable split ring tted in said groove and holding the nipple in place with the inner surface of the ange against said shoulder and the cylindrical and tapered end portions of the injector nipple in a predetermined spaced relation to the walls of said tube and cooperating therewith to denne said annular passage, said ange having a thickness substantially equal to the depth of the bore between the shoulder and the groove, said ring having a thickness such that the sum of the thickness of the flange and that of the ring is substantially equal to the distance between the shoulder and the end of the tube, whereby the nipple will not be held in seated position by the ring except when the ring is fully recessed in the groove. W

ROBERT REN LOUIS GEFFROY.

REFERENCES CITED The `following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 2,095,795 Cow-in Oct. 12, 1937 2,109,252 Jacobsson Feb. 22, 1938 2,164,256 Peterson June 27, 1939 2,348,774 Anthes May 16, 1944 FOREIGN PATENTS Number Country Date 492,560 Germany Feb. 26, 1930 

